[Bug 1945873] [NEW] vt.handoff=7 ~broken on VM

[Mason Loring Bliss]

Public bug reported:

In an install made with 21.10 beta, the default settings add vt.handoff=7 
to the primary kernel command line in /boot/grub/grub.cfg. The effect of 
this is that the virtual console is somewhat broken during boot. Prompts 
for LUKS passphrases are hidden, and once the system is done booting, getty
prompts do not show until the user navigates to another virtual console. 
(This isn't possible until the system is booted, meaning it's not a 
mitigation for accessing LUKS prompt. For that, a user can hit escape and 
be presented with a partially-functional LUKS prompt.)

Attached is an example of a getty prompt not showing. This is after hitting 
ESC to get a LUKS prompt so that disks could be unlocked, so that doesn't 
help later boot.

The system in this case is a debootstrap-installed ZFS-on-root with an ext4
MD-RAID1 /boot.

** Affects: grub (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Example of screen where getty prompt should be showing"
   https://bugs.launchpad.net/bugs/1945873/+attachment/5530170/+files/2021-10-02-143452_1024x835_scrot.png

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https://bugs.launchpad.net/bugs/1945873

Title:
  vt.handoff=7 ~broken on VM

Status in grub package in Ubuntu:
  New

Bug description:
  In an install made with 21.10 beta, the default settings add vt.handoff=7 
  to the primary kernel command line in /boot/grub/grub.cfg. The effect of 
  this is that the virtual console is somewhat broken during boot. Prompts 
  for LUKS passphrases are hidden, and once the system is done booting, getty
  prompts do not show until the user navigates to another virtual console. 
  (This isn't possible until the system is booted, meaning it's not a 
  mitigation for accessing LUKS prompt. For that, a user can hit escape and 
  be presented with a partially-functional LUKS prompt.)

  Attached is an example of a getty prompt not showing. This is after hitting 
  ESC to get a LUKS prompt so that disks could be unlocked, so that doesn't 
  help later boot.

  The system in this case is a debootstrap-installed ZFS-on-root with an ext4
  MD-RAID1 /boot.

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